Google Voice is one of those technical advancements that could change your way of communication. With it, you can sign up for a single phone number that rings every phone you own. Then you can hand out the number to everyone you know.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.